*{box-sizing:border-box;font-family:Segoe UI,Roboto,Arial,sans-serif}
body{margin:0;padding:16px;background:#0f1722;color:#e6eef6}
header{display:flex;align-items:baseline;gap:16px}
header h1{margin:0;font-size:20px}
.controls{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:12px 0}
.controls label{display:flex;align-items:center;gap:8px}
.kbd{font-size:12px;color:#9fb2c8}
.file input{display:inline-block}
.mapping-hint{display:block;font-size:12px;color:#9fb2c8;margin-left:6px}

.bandoneon{display:flex;gap:12px;margin-top:18px}
.panel{flex:1;background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:12px;border-radius:10px;border:1px solid rgba(255,255,255,0.03);overflow:hidden}
.panel h2{margin:0 0 8px 0;font-size:14px;color:#dbeeff}
.panel .grid{display:grid;grid-template-columns:repeat(8,1fr);grid-auto-rows:72px;gap:8px;position:relative}
.panel .layout{position:relative;width:100%;min-height:700px;padding:12px 0}
button{background:#1f2937;color:#e6eef6;border:1px solid rgba(255,255,255,0.04);padding:8px 10px;border-radius:6px;cursor:pointer}
button:active{transform:translateY(1px)}
.button-wrapper{width:clamp(48px, 8vw, 80px);height:clamp(48px, 8vw, 80px);display:flex;align-items:center;justify-content:center}
.button-circle{width:clamp(40px, 6.5vw, 64px);height:clamp(40px, 6.5vw, 64px);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:rgba(255,255,255,0.92);cursor:pointer;border:1px solid rgba(255,255,255,0.18);transition:transform .08s, box-shadow .12s}
.button-circle:hover{transform:scale(1.06)}
.button-circle.active{transform:scale(1.14);}
.button-circle.active .halo{opacity:1;transform:translate(-50%,-50%) scale(1.05)}
.halo{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:72px;height:72px;border-radius:50%;pointer-events:none;background:rgba(255,255,255,0.24);opacity:0;transition:opacity .16s ease, transform .16s ease}
.label-text{font-size:9px;color:#0f1722;text-transform:uppercase;letter-spacing:0.04em}
.note-text{font-size:10px;color:#0f1722;font-weight:700;line-height:1.1}
.info{margin-top:12px;color:#cfe6ff}
.legend{margin-top:18px;color:#9fb2c8}
.midi-status{margin-left:8px;color:#9fb2c8}
@media (max-width:1000px){.panel .grid{grid-template-columns:repeat(4,1fr)}.panel .layout{min-height:450px}}
@media (max-width:600px){.bandoneon{flex-direction:column}.panel .grid{grid-template-columns:repeat(6,1fr)}.panel .layout{min-height:600px}}